Hello ppl! Well I have a problem. 1st of all I'm sorry but english is not my first language :)

I want to copy a movie from a rental DVD. I run DVDFab Decrypter , saving my movie at C: and then I run DVD Shrink 3.2 and save the 2nd movie at C: then I run Intervideo DVD Copy or Nero 6 so as to burn the movie in the empty DVD... But the most times it stops copying at 28% - 30%. Rarely the movie has been burned in the empty DVD.. What should I do? I really dont know if that is a problem of my SONY DVD-RW DRU 530A... As I mentioned above both Intervideo and Nero stop the most times at 30%.